WTJP22 RJTD 231800 WARNING 231800. WARNING VALID 241800. WARNING IS UPDATED EVERY 6 HOURS. STORM WARNING. SEVERE TROPICAL STORM 1820 CIMARON (1820) DOWNGRADED FROM TYPHOON 985 HPA AT 36.4N 135.1E SEA OF JAPAN MOVING NORTH 26 KNOTS. POSITION FAIR. MAX WINDS 60 KNOTS. RADIUS OF OVER 50 KNOT WINDS 130 MILES SOUTH SEMICIRCLE AND 40 MILES ELSEWHERE. RADIUS OF OVER 30 KNOT WINDS 270 MILES SOUTHEAST SEMICIRCLE AND 150 MILES ELSEWHERE. FORECAST POSITION FOR 240600UTC AT 40.8N 137.9E WITH 40 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 994 HPA, MAX WINDS 45 KNOTS. FORECAST POSITION FOR 241800UTC AT 42.5N 144.3E WITH 80 MILES RADIUS OF 70 PERCENT PROBABILITY CIRCLE. 998 HPA. BECOMING EXTRATROPICAL LOW. JAPAN METEOROLOGICAL AGENCY.=